/* * QEMU NVRAM emulation for DS1225Y chip * * Copyright (c) 2007-2008 Herv� Poussineau * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "sysbus.h" #include "trace.h" typedef struct { DeviceState qdev; uint32_t chip_size; char *filename; QEMUFile *file; uint8_t *contents; } NvRamState; static uint32_t nvram_readb (void *opaque, target_phys_addr_t addr) { NvRamState *s = opaque; uint32_t val; val = s->contents[addr]; trace_nvram_read(addr, val); return val; } static uint32_t nvram_readw (void *opaque, target_phys_addr_t addr) { uint32_t v; v = nvram_readb(opaque, addr); v |= nvram_readb(opaque, addr + 1) << 8; return v; } static uint32_t nvram_readl (void *opaque, target_phys_addr_t addr) { uint32_t v; v = nvram_readb(opaque, addr); v |= nvram_readb(opaque, addr + 1) << 8; v |= nvram_readb(opaque, addr + 2) << 16; v |= nvram_readb(opaque, addr + 3) << 24; return v; } static void nvram_writeb (void *opaque, target_phys_addr_t addr, uint32_t val) { NvRamState *s = opaque; val &= 0xff; trace_nvram_write(addr, s->contents[addr], val); s->contents[addr] = val; if (s->file) { qemu_fseek(s->file, addr, SEEK_SET); qemu_put_byte(s->file, (int)val); qemu_fflush(s->file); } } static void nvram_writew (void *opaque, target_phys_addr_t addr, uint32_t val) { nvram_writeb(opaque, addr, val & 0xff); nvram_writeb(opaque, addr + 1, (val >> 8) & 0xff); } static void nvram_writel (void *opaque, target_phys_addr_t addr, uint32_t val) { nvram_writeb(opaque, addr, val & 0xff); nvram_writeb(opaque, addr + 1, (val >> 8) & 0xff); nvram_writeb(opaque, addr + 2, (val >> 16) & 0xff); nvram_writeb(opaque, addr + 3, (val >> 24) & 0xff); } static CPUReadMemoryFunc * const nvram_read[] = { &nvram_readb, &nvram_readw, &nvram_readl, }; static CPUWriteMemoryFunc * const nvram_write[] = { &nvram_writeb, &nvram_writew, &nvram_writel, }; static int nvram_post_load(void *opaque, int version_id) { NvRamState *s = opaque; /* Close file, as filename may has changed in load/store process */ if (s->file) { qemu_fclose(s->file); } /* Write back nvram contents */ s->file = qemu_fopen(s->filename, "wb"); if (s->file) { /* Write back contents, as 'wb' mode cleaned the file */ qemu_put_buffer(s->file, s->contents, s->chip_size); qemu_fflush(s->file); } return 0; } static const VMStateDescription vmstate_nvram = { .name = "nvram", .version_id = 0, .minimum_version_id = 0, .minimum_version_id_old = 0, .post_load = nvram_post_load, .fields = (VMStateField[]) { VMSTATE_VARRAY_UINT32(contents, NvRamState, chip_size, 0, vmstate_info_uint8, uint8_t), VMSTATE_END_OF_LIST() } }; typedef struct { SysBusDevice busdev; NvRamState nvram; } SysBusNvRamState; static int nvram_sysbus_initfn(SysBusDevice *dev) { NvRamState *s = &FROM_SYSBUS(SysBusNvRamState, dev)->nvram; QEMUFile *file; int s_io; s->contents = qemu_mallocz(s->chip_size); s_io = cpu_register_io_memory(nvram_read, nvram_write, s, DEVICE_NATIVE_ENDIAN); sysbus_init_mmio(dev, s->chip_size, s_io); /* Read current file */ file = qemu_fopen(s->filename, "rb"); if (file) { /* Read nvram contents */ qemu_get_buffer(file, s->contents, s->chip_size); qemu_fclose(file); } nvram_post_load(s, 0); return 0; } static SysBusDeviceInfo nvram_sysbus_info = { .qdev.name = "ds1225y", .qdev.size = sizeof(SysBusNvRamState), .qdev.vmsd = &vmstate_nvram, .init = nvram_sysbus_initfn, .qdev.props = (Property[]) { DEFINE_PROP_UINT32("size", SysBusNvRamState, nvram.chip_size, 0x2000), DEFINE_PROP_STRING("filename", SysBusNvRamState, nvram.filename), DEFINE_PROP_END_OF_LIST(), }, }; static void nvram_register(void) { sysbus_register_withprop(&nvram_sysbus_info); } device_init(nvram_register)